Bit and tool holder



Dec. 8, 1936. o. SEVERSON BIT AND TOOL HOLDER Filed Sept. 9, 1935 INVENTOR. 01.: Szvsresorv BY W 7 A TORNEY Patented Dec. 8, 1936 i UNITED STATE PATENT OFFICE BIT AND TOOL HOLDER Ole Severson, Shelton, Conn., assignor to The Apex Tool & Cutter Company, Inc., a corporation of Connecticut Application September 9, 1933, Serial No. 688,731

1 Claim. (Cl. 29-400) This invention relates to improvements in bits In the drawing, the numeral 10 indicates the and tool holders, and is particularly concerned shank, or body, of the tool holder, which may be with holders for the tools of metal working ma straight, as indicated, or which may be angularly chines, such, for instance, as for the holding of disposed or otherwise configured, in accordance tools for turning, boring and planing machines. with the particular operation for which the holder It is among the general objects of the invention is designed. The forward end of the body is furto provide a simple, economical and efiicient tool cated to form a lower bit receiving platform ll, holder of the class designated. and an upper overlying lip I2. The intermediate It is among the more specific objects to provide space, which is adapted to receive the shank I3 a tool holder having a minimum number of parts, of the bit, is provided with a lower slanted sur- 0 and which lends itself to ease of adjustment and face Hi, and preferably, with a contiguous upper to particular rigidity in the proper securement slanting surface [5. The upper surface of the therein of a metal working tool or bit. Numerous platform II is also preferably Provided W a other objects will be apparent from a consideraeg Centrally disposed W c is tion of the drawing and the following specifiadapted to co operate with channels in the lower 5 cation. face of the bit, so as to assist in the retention of In the drawing, Figure 1 is a plan view of one the bit against lateral displacement. As indipreferred embodiment of the invention with the cated in Figure 3, the Channel y e p u a tool bit in place, in number, so as to provide for a transverse ad- Figure 2 is a side elevation of the device shown i'us t of the bit in the holder. The dy of in Figure 1, the same being broken away on the e b t, Whieh is PTOVided W a Cutting edge, is 20 section line 22 of Figure 1. generally indicated by the number IS. The upper Figure 3 is an end elevation of that form of the p i2 is DTOVided With a securing means, W c s invention shown i Fi ur 1 nd 2; and here illustrated as in the form of a set screw I9,

Figures 4 and 5 are views illustrating possible e same being threadedly ju b through 25 modifications of tool bits which may be used in the lip and having a conical Point so as to connection with the holder. e a e the bit- In tool holders of the class to which this inven- While it has been ellstemary, as in e Pat n fion relates, the development of simplicity and referred to above, to secure the bit within the th red ctio of th n mber of t t t t holder by the direct thrust thereon of the screw, 30 less of security in t rigid clamping of t h t some means are usually required to further assure therein, is one of the main problems encountered. the bit against Outward movement:- In the p es- Up t t present ti it h b t general ent invention, such assurance is provided by the practice t use for h seeurement simple engagement of the inner conical face of the screw curing element such as a screw, which, normally, With an oppositely inclined surface 011 the 35 presses directly against the bit so as to secure it thus, the thrust of the screw is both w d y against, an oppositely disposed face and rearwardly, S0 as 130 firmly press the bit back Attempts have been made to use intermediate against the face of its receiving perture. cam faced elements, so that the securing screw As indicated in Figure it W l be noted that may act indirectly therethrough as a, means of the thrust Of the screw tends to move the bit 40 urging the bit in a direction at an angle to the rearwardly as Well as downwardly, u r atin thrust of the screw. In the present invention, a locking pressure we n the screw and the the screw, itself, is used in such manner as to slanting face l4. Y this construction, t ay be co-operate with the bit, so as to effect the desired Permissabie to avoidthe use of the Customary angular thrust of the bit with respect to direcfront lip on the lower platformu y, he 45 t of t t of th screw The present, invenaxially extending rib IE will engage the channels tion uses this novel feature in combination with of the bit, as to preclude a a displacement.

a holder constructed somewhat in accordance As noted by the illustration 0f Figures 4 a d with the Lindmark Patent No. 1,443,752, which h provision of the eo-operating an ing ur- 50 has been assigned to the assignee of this invenface of the bit may be formed either by a t ns- 50 tion. However, it will be readily understood that versely ext d substantially V-shaped slot the invention is not limited to its application to 25, as in Figure 4; or by one or more conical this specific tool holder, the inventive concept bedepressions 22, as shown in Figure 5. In either ing broadly applicable to various other types of instance, the conical taper 20 of the screw 19 holders. Will act to thrust the bit rearwardly as well as 55 downwardly, thus to lock it against the lower platform as well as against the surface I4. The structure here shown illustrates the possibility of wide ranges of tolerances in the formation of the bit receiving aperture, thus, accurate and expensive milling operations in the formation of the holder may be avoided.

From the foregoing, it will be noted that the invention is simple in construction, provides ease of placement and the removal of the bit from the holder, may be readily adjustable and is particularly designed to meet the rigid tests of accuracy which the metal working industries require. Obviously, the invention is not confined to all of the details here illustrated or described. The size, shape and number of the ribs I G or the channels I! may be varied, as may be the number of screws 19, and the exact configuration of both of the surfaces l4 and I5, and the configuration which provides thecammlng surface for the co-operation with the conical end of the securing means. Therefore, numerous changes and modifications and the full use of equivalents may be made without departing from the spirit or scope of the invention as outlined in the appended claims. What I claim is:

In a tool holder and tool bit assembly, a tool holder comprising an elongated tool holder body of a substantially rectangular cross-section having, at one end thereof, a furcated formation characterized by a central transversely extending aperture, having an obliquely inclined end wall, adapted to receive a tool bit shank; the lower furcation of the tool holder body forming, upon its upper surface, a bit-receiving platform having a plurality of independent ribs extending longitudinally of the tool holder body; the upper furcation having a lower surface parallel to the top surface of the lower furcation and extending longitudinally less than the lower furcation, and comprising a lip internally threaded to receive therein, for threaded adjustment, a conical pointed bit securing screw in said lip and a tool bit mounted between said furcation, including a shank longitudinally recessed and receiving therein, the longitudinal ribs of the upper surface of the lower furcation, and having this upper surface provided with means receiving the conical point of the securing screw of the upper furcation, said means having a cooperating side wall substantially parallel to said obliquely inclined end wall and coacting with said screw to seat said bit against said end wall of the furcation.

OLE SEVERSON. 

